Replace Maps library tour link in Storage template with current URL.

tools/dom/templates/html/impl/impl_Storage.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 /**
  * The type used by the
  * [Window.localStorage] and [Window.sessionStorage] properties.
  * Storage is implemented as a Map<String, String>.
  *
  * To store and get values, use Dart's built-in map syntax:
  *
  *     window.localStorage['key1'] = 'val1';
  *     window.localStorage['key2'] = 'val2';
  *     window.localStorage['key3'] = 'val3';
  *     assert(window.localStorage['key3'] == 'val3');
  *
  * You can use [Map](http://api.dartlang.org/dart_core/Map.html) APIs
  * such as containsValue(), clear(), and length:
  *
  *     assert(window.localStorage.containsValue('does not exist') == false);
  *     window.localStorage.clear();
  *     assert(window.localStorage.length == 0);
  *
  * For more examples of using this API, see
  * [localstorage_test.dart](http://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/tests/html/localstorage_test.dart).
  * For details on using the Map API, see the
- * [Maps](http://www.dartlang.org/docs/library-tour/#maps-aka-dictionaries-or-hashes)
+ * [Maps](https://www.dartlang.org/guides/libraries/library-tour#maps)
  * section of the library tour.
  */
 $(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS
     implements Map<String, String> {
 
   void addAll(Map<String, String> other) {
     other.forEach((k, v) { this[k] = v; });
   }
 
   // TODO(nweiz): update this when maps support lazy iteration
@@ skipping 39 matching lines @@
     return values;
   }
 
   int get length => _length;
 
   bool get isEmpty => _key(0) == null;
 
   bool get isNotEmpty => !isEmpty;
 $!MEMBERS
 }